Linepithema oblongum and Pseudacteon

Wham! A parasitic phorid fly (Pseudacteon) plants her ovipositor between the abdominal sclerites of a Linepithema oblongum worker ant to lay her egg. The oviposition takes less than a second. The hapless ant will later be consumed alive by the developing fly larva.
Termas de Reyes, Jujuy, Argentina